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(A) Semi-preparative HPLC profile of the crude reaction mixture for isolation of [18F]FESCH (column: Reprosil-Pur 120 C18-AQ, 250 × 10 mm, particle size: 10 µm, eluent: 50% MeCN/20 mM NH4OAcaq., flow: 7 mL/min). (B) Analytical HPLC profile of the formulated radiotracer [18F]FESCH spiked with the non-radioactive reference FESCH (column: Reprosil-Pur 120 C18-AQ, 250 × 4.6 mm, particle size: 5 µm; eluent: 26-90-26% MeCN/20 mM NH4OAcaq., flow: 1 mL/min).
